* The hinge point of the clamp is optimized and the optimized Z-shaped reversal six-bar mechanism increases the breakout force by more than 35% at high-level unloading positions, which can better meet the reversal the gripping force of the clamp, and the arm. of force of the oil cylinder of the upper clamp is extended to increase the clamping force by more than 30%
* The upper clamp is widened and a reinforcement plate is added to the side to increase structural strength while a wear-resisting plate is added to the bottom of lower clamp to extend the service life of the clamp.
* The zigzag structure can increase the clamping force to prevent slipping and shifting of timber.
* The enlarged diameter of upper steel pipe can improve the clamp strength.
* The extended tooth top of the lower clamp can increase the lifting efficiency.